The paper describes the efforts, sustained over more than a decade, to identify Freud's patient Emmy von N. Finally, Andersson's investigations have led to success: he was able to prove that she was Fanny Moser, then one of the richest women in Europe. The documents he discovered and the report of his oral history interviews provide a colorful picture of her personality.--Three letters of Freud to Fanny Moser's daughter are added.